(20) Vaccination against avian influenza can be an effective tool to supplement disease control measures and to avoid massive killing and destruction of poultry or other captive birds. Current knowledge suggests that vaccination may be useful not only as a short-term measure in emergencies but also as a long-term measure to prevent disease in situations of higher risk of introduction of avian influenza viruses from wild life or other sources. Provisions should therefore be established for both emergency and preventive vaccination.
(21) Vaccinated poultry, although protected against the clinical signs of disease, may become infected and thus contribute to the further spread of the infection. Vaccination must therefore be accompanied by appropriate surveillance and restriction measures established at Community level. Therefore, the vaccination strategy should allow differentiation between infected and vaccinated animals. Products of vaccinated poultry, such as meat and table eggs, should be then placed on the market in accordance with the relevant Community legislation, including this Directive
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